Rockwell Automation 5720 DriveLogix System - Manual (Page 161)

Publication 20D-UM002C-EN-P - November 2003
Communicating with Devices on a ControlNet Link 7-15
The DriveLogix controller can send typed or word-range commands to PLC-5
controllers. These commands read and write data differently. The following
diagrams show how the typed and word-range commands differ.
The DriveLogix controller can process messages initiated from PLC or SLC
controllers. These messages use data table addresses. In order for these
controllers to access tags within the DriveLogix controller, you map tags to
data table addresses.
Mapping addresses
The programming software includes a PLC/SLC mapping tool which allows
you to make an existing controller array tag in the local controller available to
PLC-2, PLC-3, PLC-5, or SLC controllers.
To map addresses:
16-bit words in
PLC-5 controller 32-bit words in
DriveLogix controller
The typed commands maintain data structure and value.
1
2
3
4
Typed read command
1
2
3
4
16-bit words in
PLC-5 controller 32-bit words in
DriveLogix controller
The word-range commands fill the destination tag contiguously. Data
structure and value change depending on the destination data type.
1
2
3
4
Word-range read command
1
3
2
4